From owner-freebsd-questions@FreeBSD.ORG Sun Aug 22 03:21:16 2010 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 6924B1065694 for ; Sun, 22 Aug 2010 03:21:16 +0000 (UTC) (envelope-from leschnik@gmail.com) Received: from mail-wy0-f182.google.com (mail-wy0-f182.google.com [74.125.82.182]) by mx1.freebsd.org (Postfix) with ESMTP id AFB318FC08 for ; Sun, 22 Aug 2010 03:21:15 +0000 (UTC) Received: by wyj26 with SMTP id 26so6380940wyj.13 for ; Sat, 21 Aug 2010 20:21:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=O9pcwIsfJP0rA0iOd77uHn6qZZPakwxHo0kJ6blwnaY=; b=mAa51sPmqOr7JylCKIkTxXPH6lnrH8nUFtFEf0TlnfZc2g7kG9s3cbtq8JwsApjVKI eWI+gDQR6STQlbq5PdAEyePDlsq7gMvg+wW7YYNoXfwnLgRfMHakSbUh0Uqg0eZha6+L LyAXzEHnq3Txng4C6keZ1VAwRp0T6iA/hQ5CE= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=YPCxlsXjzV+LHctvVGVnHMR2ffLJ+niOz58zvSBA5o2XcsAx4zv4dIYl/ylklPaE05 tVMhB+Cl2AsX4+LnbJpdzF6Kl+h4Nu6M5aMt0kejNxDCYLrYHNf8Z6jccLnJ97wtcAaT A6Eh9cZhEVBg0/HDnstJPPoDTMWYae8cvaPEc= MIME-Version: 1.0 Received: by 10.216.46.15 with SMTP id q15mr2981472web.103.1282446837098; Sat, 21 Aug 2010 20:13:57 -0700 (PDT) Received: by 10.216.188.203 with HTTP; Sat, 21 Aug 2010 20:13:57 -0700 (PDT) In-Reply-To: <4C701AF1.7030304@stefreak.de> References: <4C701170.9080306@stefreak.de> <4C701AF1.7030304@stefreak.de> Date: Sun, 22 Aug 2010 13:13:57 +1000 Message-ID: From: Jason Leschnik To: freebsd-questions@freebsd.org Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Subject: Re: IO fluctuation X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 22 Aug 2010 03:21:16 -0000 http://forums.freebsd.org/showthread.php?t=17036& This is a good starting point, there is also some good info using certain tools to force the drives to not goto spindown sleep. On Sun, Aug 22, 2010 at 4:29 AM, Steffen Neubauer wrote: > Hello Claudiu :) > > Sorry that I didn't answer these obvious questions in my first post. > > Am 21.08.2010 20:16, schrieb claudiu vasadi: > > How did you setup your drives in ZFS ? stripe ? >> > > raidz1 .... Here is my zpool status output: > > # zpool status > pool: tank > state: ONLINE > scrub: none requested > config: > > NAME STATE READ WRITE > CKSUM > tank ONLINE 0 0 > 0 > raidz1 ONLINE 0 0 > 0 > gptid/7b91a9b4-ab05-11df-8c6e-001d7d004144 ONLINE 0 0 > 0 > gptid/7cebaf7b-ab05-11df-8c6e-001d7d004144 ONLINE 0 0 > 0 > gptid/7e43d7a2-ab05-11df-8c6e-001d7d004144 ONLINE 0 0 > 0 > > errors: No known data errors > > > what bsd version do you have and what platform ? >> > > # uname -a > FreeBSD tank 8.1-RELEASE FreeBSD 8.1-RELEASE #0: Mon Jul 19 02:36:49 UTC > 2010 root@mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64 > > > > Do you see this big fluctuation when copying some big file like say and >> iso >> or movie ? >> > > Both, on small filesystem access and when copying big files. > When I'm listening to music with VLC over NFS it stalls regularly. > When I'm working on the shell the commands block randomly for a certain > time. > > But I get that fluctuation on raw device access, too, look: > > # dd if=/dev/ad0 of=/dev/zero bs=1M > ^C0+0 records in > 0+0 records out > 0 bytes transferred in 9.848682 secs (0 bytes/sec) > # dd if=/dev/ad0 of=/dev/zero bs=1M > ^C1056+0 records in > 1056+0 records out > 1107296256 bytes transferred in 9.492375 secs (116651130 bytes/sec) > > So this is not a zfs problem. But I don't think it's the hardware, too - I > used that mainboard before FreeBSD with no problems. > And the WD EARS drives can't be the problem on raw device access, too, > because I used bs=1M, that should be enough... > > This is really strange... > > Greetings, > Steffen > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to " > freebsd-questions-unsubscribe@freebsd.org" > -- Regards, Jason Leschnik. Mob. 0432 35 4224 Uni mail. jml974@uow.edu.au Work mail. jll@ansto.gov.au